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MySql Table Insert if not exist otherwise update
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Jai is correct that you should use INSERT ... ON DUPLICATE KEY UPDATE.
Note that you do not need to include datenum in the update clause since it's the unique key, so it should not change. You do need to include all of the other columns from your table. You can use the VALUES()...
Should struct definitions go in .h or .c file?
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@τεκ Do you mean global and local visibility? public doesnt make sense in a struct. All structs are public by default.
– BugShotGG
Jul 6 '15 at 16:05
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GraphViz - How to connect subgraphs?
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In case anyone is interested in, this can cause positioning problems if you have labelled links (edges). While the head or the tail of the edge may be hidden beneath a cluster, the label is still positioned at the midpoint, mean...
Can mustache iterate a top-level array?
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You can do it like this...
Mustache.render('<ul>{{#.}}<li>{{.}}</li>{{/.}}</ul>', ['foo','bar','baz']);
It also works for things like this...
var obj = [{name: 'foo'}, {name: 'bar'}];
var tmp = '<ul...
Guava: Why is there no Lists.filter() function?
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It wasn't implemented because it would expose a perilous large number of slow methods, such as #get(index) on the returned List view (inviting performance bugs). And ListIterator would be a pain to implement as well (though I submitted a patch years...
What are the differences between segment trees, interval trees, binary indexed trees and range trees
...d for "which of these intervals overlap with a given interval" queries. It can also be used for point queries - similar to segment tree.
Range tree stores points, and optimized for "which points fall within a given interval" queries.
Binary indexed tree stores items-count per index, and optimized f...
Routing with Multiple Parameters using ASP.NET MVC
...nking about using ASP.NET MVC. While designing our API, we decided to use calls like the one below for the user to request information from the API in XML format:
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What does !important mean in CSS?
... of the selectors). Defining a rule with the !important 'attribute' (?) discards the normal concerns as regards the 'later' rule overriding the 'earlier' ones.
Also, ordinarily, a more specific rule will override a less-specific rule. So:
a {
/* css */
}
Is normally overruled by:
body div...
Webrick as production server vs. Thin or Unicorn?
...aken for granted that you must not use Webrick as production server, but I can't really find anywhere mentioning why. The consensus seems to be:
"Webrick is ok for development, but Thin or Unicorn is the choice for production, period."
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Vim: How to insert in visual block mode?
How can you insert when you are in visual block mode (by pressing ctrl-V) in Vim?
4 Answers
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